A couple has a child with Harman's ataxia a recessive disorder). If this couple has second child, what is the probability that child will have ataxia?

Question

Quizplus · Accepted Answer

Since Harman's ataxia is a recessive disorder, both parents must be carriers. The possible genotypes for the children are: AA (normal), Aa (carrier, normal), aa (affected). The probability of having an affected child (aa) is 1/4.

A Couple Has a Child with Harman's Ataxia a Recessive